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  2. Valve Corporation - Wikipedia

    en.wikipedia.org/wiki/Valve_Corporation

    Valve Corporation, also known as Valve Software, is an American video game developer, publisher, and digital distribution company headquartered in Bellevue, Washington.It is the developer of the software distribution platform Steam and the franchises Half-Life, Counter-Strike, Portal, Day of Defeat, Team Fortress, Left 4 Dead, and Dota.

  3. The Orange Box - Wikipedia

    en.wikipedia.org/wiki/The_Orange_Box

    Valve planned on releasing an additional compilation for Windows entitled The Black Box, which would have contained only the new material—Episode Two, Portal, and Team Fortress 2. The Black Box was later cancelled for retail and is now only available through Steam exclusively to owners of certain ATI graphics cards, who received a voucher for ...

  4. Aortic valve - Wikipedia

    en.wikipedia.org/wiki/Aortic_valve

    The aortic valve normally has three cusps or leaflets, although in 1–2% of the population it is found to congenitally have two leaflets. The aortic valve is the last structure in the heart the blood travels through before stopping the flow through the systemic circulation.

  5. Pulmonary valve - Wikipedia

    en.wikipedia.org/wiki/Pulmonary_valve

    The pulmonary valve (sometimes referred to as the pulmonic valve) is a valve of the heart that lies between the right ventricle and the pulmonary artery and has three cusps. . It is one of the four valves of the heart and one of the two semilunar valves, the other being the aortic val

  6. Percutaneous aortic valve replacement - Wikipedia

    en.wikipedia.org/wiki/Percutaneous_aortic_valve...

    Percutaneous aortic valve replacement (PAVR), also known as percutaneous aortic valve implantation (PAVI), transcatheter aortic valve implantation (TAVI) or transcatheter aortic valve replacement (TAVR), is the replacement of the aortic valve of the heart through the blood vessels (as opposed to valve replacement by open heart surgery).

  7. Counter-Strike - Wikipedia

    en.wikipedia.org/wiki/Counter-Strike

    Counter-Strike: Global Offensive was the fourth release in the main, Valve-developed Counter-Strike series in 2012. Much like Counter-Strike: Source the game runs on the Source engine. It is available on Microsoft Windows, OSX, and Linux, as well as the Xbox 360 and PlayStation 3 consoles, and is backwards compatible on the Xbox One console.

  8. Types of trombone - Wikipedia

    en.wikipedia.org/wiki/Types_of_trombone

    The F attachment is engaged by using a trigger which operates a valve (this is different from the three-valved valve trombone). This type of trombone is typically built with a larger bore size (0.525 or 0.547 inches (13.3 or 13.9 mm)) and is known as a B ♭ /F trombone, F-attachment trombone, or trigger trombone. [11]

  9. Vacuum tube - Wikipedia

    en.wikipedia.org/wiki/Vacuum_tube

    A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.